Apple today released macOS Sierra 10.12.2, the second update to the macOS Sierra operating system that launched on September 20. macOS Sierra 10.12.2 comes two months after the release of macOS Sierra 10.12.1, and has been in testing since October 31.
macOS Sierra 10.12.2 is a free update for all customers who are running macOS Sierra. The update can be downloaded using the Software Update function in the Mac App Store